Malicious PDF — malware analysis report

Static analysis result for SHA-256 584f3a9eabe3b24e…

MALICIOUS

PDF

74.1 KB Created: 2021-09-08 09:45:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: cc54a94c4a7ea804fe37b29fca660cae SHA-1: 17125e4dc955819f0c54a1571bd8d69d2abdf98f SHA-256: 584f3a9eabe3b24e7661c4c755eca7ba52669a6d1c087d61b563f3335272021f
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The 'SE_CALLBACK_LURE' heuristic strongly suggests a callback phishing or tech-support scam, where the document likely prompts the user to call a number for a fake issue. While no scripts were explicitly extracted, the PDF structure and embedded URLs pointing to potentially compromised domains suggest it's designed to exploit users through social engineering tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL http://pokewaveanaheim.com/uploads/files/64866264289.pdf In PDF document text
    • http://ongnuocdenhat.com/upload/files/fanudemiwuredidonojabez.pdfIn PDF document text
    • http://sad-azov.ru/wp-content/plugins/super-forms/uploads/php/files/f89378759da59f813b83fff5b5a8962f/88660549092.pdfIn PDF document text
    • https://transcendenceit.com/wp-content/plugins/super-forms/uploads/php/files/dfa0f0e3443b44ab5a2f4e797d913b94/guvizidazodoka.pdfIn PDF document text
    • http://aldo-ins.com/userfiles/file/sumovukakepate.pdfIn PDF document text
    • https://shoppingplanet.ro/ckfinder/userfiles/files/17615570035.pdfIn PDF document text
    • http://www.dj-csnl.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16079bf2e82c7b---nitiwikiwa.pdfIn PDF document text
    • http://nedirajtebosnu.net/userfiles/file/gopobumikojomiv.pdfIn PDF document text
    • http://adabaskimerkezi.com/upload/file/37065691606.pdfIn PDF document text
    • https://www.gsccn.it/wp-content/plugins/formcraft/file-upload/server/content/files/160ac16d824577---6199931000.pdfIn PDF document text
    • https://hgqq.hk/tony/churchofgod/ckfinder/userfiles/files/2126141984.pdfIn PDF document text
    • https://ezastupitelstvo.sk/editor_uploads/system/files/nujasabezunarazujum.pdfIn PDF document text
    • http://www.skupp.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160ac1e484f12e---23266851225.pdfIn PDF document text
    • http://www.kidnuri.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d27fdec6b57---55517132667.pdfIn PDF document text
    • http://chagatea.ru/wp-content/plugins/super-forms/uploads/php/files/b0cde90e1d5d90d59b39286c4f5ca142/42200045399.pdfIn PDF document text
    • http://fortlauderdalelimorental.net/wp-content/plugins/formcraft/file-upload/server/content/files/16095f52471715---49062972673.pdfIn PDF document text
    • http://gyndoktors.de/ckfinder/userfiles/files/pewezu.pdfIn PDF document text
    • https://bdblue.com/ckfinder/userfiles/files/kusowoxakow.pdfIn PDF document text
    • http://www.etoiles-recrutement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f4b18c8c45---77291150878.pdfIn PDF document text
    • http://ctkupavna.ru/upload/file/sowufaxugifepu.pdfIn PDF document text
    • https://teenvolunteer.org/wp-content/plugins/super-forms/uploads/php/files/aecfbf3bbeecdeeae18840cb6f5659de/95241037310.pdfIn PDF document text
    • http://www.webtony.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc293300fe---57597483748.pdfIn PDF document text
    • https://www.a2zmedical.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160ae12df86a9b---wunenivuxuf.pdfIn PDF document text
    • http://podiummoda.ru/userfiles/file/zuzunisebixenikomigufufog.pdfIn PDF document text
    • http://hitecds.com/userfiles/file/71120840665.pdfIn PDF document text
    • https://talaa-obour.com/webmisr/uploadwebmisr/file/70973731669.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=restful+webservices+in+java+tutorial+pdfPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b73b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB73B 19420 bytes
SHA-256: c99cbfc2da62a1b9af1dbd25c3be9ad333685e3f554c3c7ba04ec0f0629a473d
font_01_sfnt_off0000e825.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE825 11180 bytes
SHA-256: 3d25eb488138ea02bef6ec25c9a603c933363b0b6bf03899504fb0a4fafc7490
font_02_sfnt_off00010241.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10241 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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